-3(2c-3)=21

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Solution for -3(2c-3)=21 equation: 



-3(2c-3)=21

We move all terms to the left:

-3(2c-3)-(21)=0

We multiply parentheses

-6c+9-21=0

We add all the numbers together, and all the variables

-6c-12=0

We move all terms containing c to the left, all other terms to the right

-6c=12

c=12/-6

c=-2

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